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Cogging Torque Reduction Design of Permanent Magnet Motor Using Analytical Method
방량(Liang Fang),이병화(Byeong-Hwa Lee),홍정표(Jung-Pyo Hong) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this paper, an analytical method used for predicting the magnetic field distribution and cogging torque characteristic in a permanent magnet synchronous motor (PMSM) is presented. The magnetic field is analyzed with the space harmonic analysis, and the cogging torque is calculated based on the air-gap field distribution and slot-opening effect considered by relative permeance. The validity of the presented analytical method is confirmed by 2-dimensional finite element analysis (FEA). Then this analytical method combines with response surface methodology (RSM) is applied to the prototype PMSM model rebuilding in order to minimize the cogging torque. Finally, an optimized PMSM model is built and the cogging torque reduction is confirmed by FEA.
방량(Liang Fang),김도진(Do-Jin Kim),홍정표(Jung-Pyo Hong) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
This paper proposes an effective assistant model for considering the stator slot-opening effect on air gap flux density distribution in conventional interior-type permanent magnet (IPM) motor. Different from the conventional slot-opening effect analysis in surface-type PM (SPM) motor, a composite effect of slot-opening uniquely existing in IPM motor, which additionally causes enhancement of air gap flux density due to magnet flux path distortion in iron core between the buried PM and rotor surface. This phenomenon is represented by a proposed assistant model, which simply deals with this additional effect by modifying magnetic pole-arc using an effective method. The validity of this proposed analytical model is applied to predict the air gap flux density distribution in an IPM motor model and confirmed by finite element method (FEM).
극수/슬롯수 조합에 따른 Radial Vibration Force 고려한 매입자석 동기모터 특성 연구
방량(Liang Fang),이수진(Su-Jin Lee),이병화(Byeong-Hwa Lee),홍정표(Jung-Pyo Hong) 대한전기학회 2011 전기학회논문지 Vol.60 No.5
This paper presents a comparative study on motor characteristics with specific consideration of radial vibration force in interior permanent magnet synchronous motors (IPMSM) according to pole/slot combinations. Three IPMSM models, 16-pole/15-slot design, 16-pole/18-slot design and 16-pole/24-slot design are built, in which 16-pole/15-slot and 16-pole/18-slot designs provide high winding factor and 16-pole/24-slot design is known as a general pole/slot combination. By coupling finite element analysis (FEA) with equivalent circuit method, motor characteristics, back electro-motive force (Back-EMF), inductances, cogging torque, etc. as well as machine output performances are analyzed and compared. The radial vibration force (RVF) distribution in air gap causing stator vibration and noise is interested. It is expected that this study help with appropriate choice of pole/slot combination in IPMSM design.
Improvement of efficiency in Multi-layer IPMSM using Response Surface Methodology
방량(LIANG FANG),권순오(SOON-O KWON),이상호(SANG-HO LEE),장붕(PENG ZHANG),홍정표(JUNG-PYO HONG) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper deals with the optimum rotor design approach about the multi-layer design of the buried magnets in an Interior Permanent Magnet Synchronous Motor (IPMSM), on the efficiency improvement by using Response Surface Methodology (RSM). In the multi-layer design of the prototype 15㎾ IPMSM, the constant amount of buried PM is split from the single-layer into double-layer design for improving the efficiency characteristics. The optimum double-layer rotor structure is built with the help of RSM analysis. The improvement of IPMSM efficiency is verified by the Finite Element Method (FEM) results comparison with the prototype single-layer IPMSM.